Electric motor



(No lllodel.) I

' J. F. MCLAUGHLIN.

ELECTRIC MOTOR.

No. 375,560. Patented Dec. 27, 1887.

PETERS, Phuto-Ulhcgnphor. Wnhingloo. a, e

UNITED STATES PATENT OFFICE.

JAMES F. MOLAUGHLIN, OF PHILADELPHIA, PENNSYLVANIA.

' ELECTRIC MOTOR.

SPECIFICATION forming part of Letters Patent No. 375,560, dated December27, 1887. Application filed December 16, 1886. Serial No. 221,765. (Nomodel.)

To all whom it may concern:

Be it known that I, JAMES F. MOLAUGHLIN, a citizen of the United States,residing in Philadelphia, Pennsylvania, have invented certainImprovements in Electric Motors, of which the following is aspecification.

My invention consists of certain improvements in the construction ofelectric motors, as fully described hereinafter.

In the accompanying drawings Figure 1 is a side View of my improvedmotor. Fig. 2 is a vertical section on the line 1 2, Fig. 1. Fig. 3 is avertical section on the line 3 4., Fig. 1; and Fig. 4 is a diagram ofthe circuits.

My improved motor is of that construction in which armatures revolvebetween fixed fieldmagnets which are'on opposite sides of the armatures.I

The frame of the machine consists in the present instance of abase-plate, a, and end standards, a, which are provided with bearingsfor the longitudinal shaftor axis A, carrying the armatures andcoinmutators. To these standards a are secured the electro magnets E E,constituting the field-magnets.

Each field-magnet consists of two coils, e,

having their cores united by the standard a,

orby a suitable plate'of. magnetic metal, so that each field-magnetconsists of a horseshoe. The horseshoe fieldanagnet E is arranged in aplane at right angles to the horseshoe fieldmagnet E, as shown inFig. 1. I prefer to provide thefield-magnets E E with extendedpole-pieces e, carried on a radius from the axis of the armature-shaft.

Each armature consists of a pair of electromagnets, FF", secured to acruciform metal plate, f, mdunted onthe aXis'A. This plate is ofmagnetic metal, so that it will form the connecting-plate for the twocoils of each magnet to form a horseshoe-magnet corresponding with thehorseshoe field-magnets. magnets are secured on opposite sides of thesame plate f, and in planes at right angles to The two each other, inorder toobtain a better me- 5 chanical balance, as well as a moreconvenient arrangement of parts. The poles of the armatures are providedwith extended polepieces f, similar to those on the field-magnets.

The armature-shaft carries two commutators, G, of any convenientconstruction. In the present instance each commutator consists of a pairof insulated plates connected to the coils of the correspondingarmature. On the periphery of each commutator bear springcommutator-brushes b.

The circuits will be clearly understood on reference to Fig. 4, fromwhich it will be seen that the coils of the field-magnets and armaturesare in series. Beginning at the bindingpost p, the circuit is throughthe coils of the fieldmagnets E, thence to one of the commutator-brushesand armature-coils, and from the second commutator-brush to the coils ofthe field-magnets E on the other side of the machine.Thecircuit,asl$efore,isthencethrough 'the commutator, armature-coils,and commuvolving between two field-magnets, the fieldmagnets beinghorseshoe-magnets in planes at right angles to each other, and thearmatures being also horseshoe-magnets in planes at right angles to eachother.

2. The combination of the field-magnets E and E with intermediaterevolving armatures consisting of electro-magnets carried by a centralcruciform plate, the pairs of electro-magnets being on opposite sides ofthe plate and in planes at right angles to each other.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES F. MOLAUGHLIN.

Witnesses:

WILLIAM D. OoNNEa, HARRY SMITH.

